文章利用脐点的性质研究了二次曲面的圆截口问题，并给出了与二次曲面交线为圆的圆截口的方程的一种求法。

In this paper, we make use of the properties of the umbilic to research circle section question of quadric in 3-dimensional Euclidean space. We give the equations of these circle sections.

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文章利用脐点的性质研究了二次曲面的圆截口问题，并给出了与二次曲面交线为圆的圆截口的方程的一种求法。

In this paper, we make use of the properties of the umbilic to research circle Section question of quadric in 3-dimensional Euclidean space.

youdao